Marquell sits next to 3 phonetic neighbors — Marcel, Marquise, and Marcellus are the closest matches by sound. Most share Marquell's Roman/Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"of Mars, warlike"
"narrow piece of land"
"a rousing song of praise or national identity"
"who is like God"
"God is gracious (from Sean element)"
"spear ruler, spear power"
"one who covers"
"ridge meadow"
"island"
"gift of God (gift of Yahweh)"
"always ruler"
"son of Taveiro; from the hermitage"
"decided, resolved, determined"
"wise army, counsel-warrior"
"of Mars, warlike"
"noble valor, kingly"
"man of the army"
"courtesy title for an adult man"
"variant of Aidan, meaning little fire"
"little blind one, the blind one"
"distinguished ruler"
Similar sound: These names share phonetic patterns with Marquell — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Roman/Latin origins, giving them the same cultural heritage as Marquell.
Rhythm: Marquell is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.